Lamp Guide: Fluorescent

Miniature
Bipin T-5
Min. Bipin

Medium
Bipin T-8/T-10/T-12
Med. Bipin

Recessed Double
Contract T-8/T-12
Recessed D.C.

Slimline
Single Pin
T-8/T-12

Circleline
4-Pin

The size and shape of a bulb is designated by a letter or
letters followed by a number. The letter indicates the shape of
the bulb while the number indicates the diameter of the bulb in
eighths of an inch. For example “T-10” indicates a tubular
shaped bulb having a diameter of 10/8 or 1 1/4 inches. The
following illustrations show some of the more popular bulb
shapes and sizes.

The size and shape of a bulb is designated by a letter or
letters followed by a number. The letter indicates the shape of
a bulb while the number indicates the diameter of the bulb in
eighths of an inch. For example, “T-12” indicates a tubular
bulb having a diameter of 12/8 or 1 1/2 inches. The following
illustrations show some more popular bulb shapes and sizes.

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